Messages in this thread | | | Date | Sat, 10 Apr 1999 08:33:51 -0400 | From | Ben Bridgwater <> | Subject | Re: CPU affinity |
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Ingo Molnar wrote:
> On Fri, 9 Apr 1999, Gregory Maxwell wrote: > > > > Are there any patches available to enable some sort of CPU affinity? this > > > would be useful for some software (e.g. Informix Dynamic Server) and in > > > general would reduce cache thrashing on SMP boxes. > > > > Linux already uses a simple form of CPU affinity. Although it is quite > > simple, it is quite effective. I worked on it for about a week somewhere > > around 2.1.4x and was unable to acheve any intresting improvements. > > note that 2.2 already has a 'not so simple' cache-affinity logic. It's
> automatic and works for a wide range of cases. (let me/the list know if it > doesnt seem to work for something)
I don't have an SMP box yet, but I'm working on a real-time signal processing application that is eventually going to need the ability to hard assign processes to specified CPUs. I see this an an SMP extension of the POSIX real-time scheduling functionality - the ability to override any intelligence/algorithms in the scheduler, and statically decide an appropriate set of priorities and CPU assignments.
Ben
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